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Higher DPC latencies with C3/C6/C7 states inevitable?

Hi,

Long story short: I have a GA-P55A-UD4 and the only way to avoid dropouts using my USB DAC is to turn off C3/C6/C7 states in BIOS.

Let just say I tried everything else. Disabling devices, disabling other BIOS settings, and so on. When using the DPC Latency Checker I can clearly see that turning off C3/C6/C7 lowers the latencies. With it off the latencies top 110Ás, with it on they top 700Ás.

My questions are: Is this inevitable? Is it just how C3/C6/C7 states work? Or is it something the Gigabyte engineers could tweak? I'm using the latest F7 BIOS. The processor is an i5 750.

The downside of disabling C3/C6/C7 states is that Turbo Boost is severely crippled. Ultimately I'd like both full Turbo Boost and low DPC latencies. If possible.

Re: Higher DPC latencies with C3/C6/C7 states inevitable?

Originally Posted by warren300

does disabling c1e and eist lower latency too? or just C3/C6/C7 states?? for me c1e is the cause,also try closing easytune...that will lower latency too

Disabling C1E and/or EIST does not have a significant impact on the latencies for me. Only disabling C3/C6/C7 states does. I actually never installed EasyTune. (I'm using a very clean Windows 7 x64 install.)